I am always eager to do experiments, especially chemistry ones. It's _26_ to work with test tubes and beakers（烧杯） , even though sometimes my efforts end in__ 27 ___. Experiments were fun for me __28 a recent accident. The 29 happened when I was heating a big test tube with an alcohol burner（酒精灯） , chatting to my partner while waiting for__ 30 ____ changes. All of a sudden, the tube cracked. Even though I jumped from my seat when I heard the crack, the hair on my forehead was __ 31 ____ as I was leaning too close to the test tube. __32___ I had no time to be sad about my hair: the liquid in the test tube poured onto the table and caught fire. I'd never 33 _ anything so bad! My___ 34_ __went blank （空白）for a moment. Then I quickly covered the fire with a damp cloth to__ 35_ ___. The teacher told me that the test tube broke in half at the bottom because we didn't dry it properly before __ 36 ___ it. We calmed down and did the experiment, again. But our hearts were still __ 37_ ___ rapidly even after we walked out of the lab. But my bad __ 38 ___ didn't end there! Since all _ _39 was focused on the flames while we were in the lab, I didn't see the liquid falling onto my trousers. During the following class, I felt a __ 40_ __ in my leg. Soon it became more and more painful and I touched the area with my fingers, _41_ to make things better. But to my great 42___ , the material of my trousers turned into powder! “Vitrio（硫酸）! ! !”The terrible word came into my mind. I rushed out right away to wash and examine my poor skin. _43_ , it was not a serious injury. After changing my __ 44 ____I sat down and told myself: danger is no joke! It's very important to have a serious___ 45_ __ in chemistry class. Doing scientific experiments as a learner is no laughing matter. 小题1: A．exciting B．moving C．dangerous D．difficult 小题2: A．success B．failure C．loss D．waste 小题3: A．but B．except C．besides D．until 小题4: A．incident B．change C．disaster D．accident 小题5: A．physical B．chemical C．biological D．historical 小题6: A．broken B．burnt C．blown D．pulled 小题7: A．And B．Instead C．But D．Or 小题8: A．felt B．heard C．experienced D．imagined 小题9: A．head B．stomach C．ear D．mind 小题10: A．leave it out B．let it out C．give it out D．put it out 小题11: A．boiling B．holding C．heating D．cooking 小题12: A．striking B．beating C．knocking D．hitting 小题13: A．feeling B．time C．chance D．luck 小题14: A．effort B．sense C．attention D．spirit 小题15: A．push B．pain C．bite D．touch 小题16: A．failing B．managing C．trying D．planning 小题17: A．disappointment B．joy C．surprise D．comfort 小题18: A．Fortunately B．Obviously C．Unexpectedly D．Generally 小题19: A．coats B．shirts C．socks D．trousers 小题20: A．heart B．attitude C．thought D．preparation